<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>v-bind动态绑定class(数组语法)</title>
    <style>
      .title {
        font-size: 50px;
      }
      .active {
        color: red;
      }
      .line {
        background-color: seagreen;
      }
    </style>
  </head>
  <body>
    <div id="app">
      <h2 class="title" :class="[active,line]">{{message}}</h2>
      <h2 class="title" :class="addclass()">{{message}}</h2>
    </div>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          message: "你好呀",
          active: "active",
          line: "line",
        },
        methods: {
          addclass: function () {
            return [this.active, this.line];
          },
        },
      });
    </script>
  </body>
</html>
